Removed rule splitting

[jessevz]

closes #705

[Copilot]

Pull request overview

Removes the legacy “rule splitting” feature by deleting the associated server-side logic and retiring the related configuration options, with DB migrations to clean up existing config rows.

Changes:

• Added MySQL and Postgres migrations to delete ruleSplit* config entries.
• Removed TaskUtils::splitByRules() and the benchmark-triggered rule-splitting path in APISendBenchmark.
• Removed RULE_SPLIT_* options from DConfig config type/description mappings.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/migrations/postgres/20260317120000_remove-rule-split.sql	Deletes legacy ruleSplit* config rows in Postgres.
src/migrations/mysql/20260317120000_remove-rule-split.sql	Deletes legacy ruleSplit* config rows in MySQL.
src/inc/utils/TaskUtils.php	Removes the task splitting-by-rules implementation.
src/inc/defines/DConfig.php	Removes rule-split config options from type/description mappings.
src/inc/api/APISendBenchmark.php	Removes auto rule-splitting triggered by benchmark submission.

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